In the summer heat, pets need to stay cool too.

Veterinarians at Pennsylvania's Lancaster's Pet Emergency Treatment Services said a dog's normal body temperature is about 100 degrees, but vets sometimes see temperatures up to 108.

"The problem we run into with temperatures that high is we can get into anything from brain damage to organ failure," said Dr. Bill Lewis.

Some signs of excessive heat exposure in dogs include depression, lethargy, panting and seizures.

Heat Hazards

Experts said owners need to be aware of how heat affects their animals.

"Remember that dogs have padded feet, and the sidewalk can be too hot for them," August said. "It's a good idea to walk them on grass if possible, and preferably in the early morning or evening."

"Dog owners need to be conscious of each breed's cooling system," Thompson said. "Heat stroke is a bigger problem for dogs with shorter noses, such as boxers and bulldogs."

And don't shave your pets, thinking it will keep them cooler, experts say.

"Animals can get sunburns just like humans can," August said. "If you give your pets plenty of fresh water and shade, they should be OK, but we don't recommend shaving them unless they've had skin problems."

The Humane Society of the United States says pets may require sunscreen on their noses and ear tips. The society's site says pets with light-colored noses or light-colored fur on their ears are particularly vulnerable to sunburn and skin cancer.

Thompson also reminded pet owners not to leave pets waiting in cars, and to make sure that if a pet is left outside during warm weather, it has access to shade and water. The league also encourages pet owners to check their pet's water bowl often.

And keep your cats inside safely by ensuring your house's window screens are secure. According to the ACL's Web site, many house cats are seriously injured every summer in falls from upper-level windows.